EP2038551B1 - Piston pump for a vehicle braking system with a sealing element - Google Patents

Piston pump for a vehicle braking system with a sealing element Download PDF

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Publication number
EP2038551B1
EP2038551B1 EP07729395A EP07729395A EP2038551B1 EP 2038551 B1 EP2038551 B1 EP 2038551B1 EP 07729395 A EP07729395 A EP 07729395A EP 07729395 A EP07729395 A EP 07729395A EP 2038551 B1 EP2038551 B1 EP 2038551B1
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EP
European Patent Office
Prior art keywords
piston
sealing element
piston rod
sealing
piston pump
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EP07729395A
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German (de)
French (fr)
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EP2038551A1 (en
Inventor
Wolfgang Schuller
Marc Zimmermann
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2038551A1 publication Critical patent/EP2038551A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4031—Pump units characterised by their construction or mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0448—Sealing means, e.g. for shafts or housings

Definitions

  • the invention relates to a piston pump for a vehicle brake system, comprising a housing section and a piston, which is displaceably guided in the housing section and a receiving means for receiving an inlet valve, a sealing element adjoining the receiving means for sealing the piston against the housing section and a subsequent to the sealing element Piston rod has
  • the piston pumps used for known vehicle brake systems serve to control the pressure in wheel brake cylinders.
  • the piston pumps are provided for example for returning brake fluid from one or more wheel brake cylinders into a master brake cylinder.
  • the ABS often works in combination with an anti-skid system (abbr .: ASR).
  • ASR anti-skid system
  • ESP electronic stability program
  • ABS and ASR work in the longitudinal direction of travel
  • ESP influences the lateral dynamics and is therefore in principle a traverse slip control.
  • Piston pumps are used for all these systems and also for other systems to increase driving safety.
  • piston pumps consist inter alia of a housing formed in a cylinder in which a piston is received longitudinally movable.
  • the piston drive is usually carried out via an eccentric drive, in which the rotational movement of a driven by a drive motor shaft is converted into a translational movement of the piston.
  • the piston rod is pressed with its end face by means of a biasing element, for example in the form of a helical spring, against the outer periphery of the eccentric of the eccentric drive.
  • a sealing element is further provided, which is longitudinally movably guided in the cylinder.
  • the piston of known piston pumps is mounted with its arranged inside the cylinder end face on the sealing element, so that a reciprocating piston movement is transmitted directly to the sealing element.
  • a valve seat of the inlet valve designed as a seat valve is provided, wherein a bore extending through the sealing element is provided for fluid inflow, which extends to the valve seat in order to flow through the inlet valve which is open in the suction phase with fluid.
  • the shut-off of the inlet valve designed as a seat valve is pressed by a spring element against the valve seat formed on the sealing element, wherein the shut-off, the spring element and formed as a valve seat end of the sealing element are accommodated in a receiving means in the form of an inlet valve cover.
  • the inlet valve cover serves as a counterhold for the spring element and as a guide for the shut-off.
  • a biasing member in the form of a coil spring which presses against a support body formed on the inlet valve cover received in a recess formed in the seal member to apply the spring force transmitted to the support body via the seal member
  • a bias voltage can ultimately be transmitted to the piston in order to press the outer end face of the piston against the eccentric of the eccentric drive.
  • WO 2006/013142 A (Next Related Art) is known a piston pump with a holding device for holding a spring element for returning a closing element of a valve.
  • the holding device rests with a sealing area on an end face of the piston.
  • the invention has for its object to provide a piston pump for a vehicle brake system that can be assembled and disassembled with little effort, and also can be produced inexpensively.
  • the sealing element is formed integrally with the receiving means.
  • This has the advantage that, in contrast to the piston pumps known from the prior art, the functions of the sealing element and the receiving means provided for receiving an inlet valve are taken over by only one component.
  • a component is saved, with the result that the assembly and disassembly of the piston pump according to the invention can be made very easily and the tolerance chain is significantly reduced.
  • the manufacturing costs of the piston pump can be significantly reduced by the inventively realized saving of a component.
  • the piston pump according to the invention can be made significantly smaller by saving a component compared to known pumps.
  • the snap connection which is preferably formed on the sealing element, surrounds, for example, a shoulder formed on the piston rod.
  • the piston rod during assembly of the piston pump in particular during assembly on the cylinder via the inventively provided snap action on the sealing element can be maintained.
  • the cylinder inner wall is protected from the outer diameter of the piston by means of the snap connection according to the invention.
  • the inlet valve has a valve seat, which is formed on the piston rod.
  • a biasing element preferably provided in the form of a helical spring, which bears against the sealing element and with which the piston is forced out in the direction of the housing portion.
  • the biasing force transmitted to the sealing element by the biasing element always keeps the piston in the outer position.
  • the outer end face of the piston can be pressed against the eccentric of an eccentric drive, so as to convert a provided by the eccentric drive translational drive movement in a reciprocating pumping movement of the piston.
  • the piston pump according to the invention can be used in conjunction with eccentric drives, which are preferably used in brake systems for driving the piston pumps.
  • the sealing element is designed in the form of a sealing ring with a sealing ring opening and the piston rod is received in the sealing ring opening, wherein the piston rod is preferably received with a clearance fit in the sealing ring opening.
  • a clearance fit By means of a clearance fit, the piston rod can be easily centered in the sealing ring opening. Furthermore, a clearance allows a required for disassembly problem-free release of the piston rod from the seal ring opening.
  • the Fig. 1 shows a piston pump 10 according to the invention.
  • the piston pump 10 comprises two housing sections 12 and 14, wherein in the housing sections 12, a cylinder bore 16th is formed, in which a piston 26 is slidably guided.
  • the piston 26 comprises a sealing element in the form of a sealing ring 18, a receiving means 20 for a designed as a ball seat inlet valve 22 which is integrally formed with the sealing ring 18 and in the present case is formed as an inlet valve cover, and a piston rod 62, the
  • the piston rod 62 is formed in two pieces and comprises two piston rod elements 28, 30, wherein the piston rod member 28 is received by means of a press fit firmly in the piston rod member 30 to provide a frictional connection between the two piston rod elements 28, 30.
  • the proposed two-piece design of the piston rod 62, a cost-producing piston rod 62 can be realized, since the invention, a cost rod-shaped piston rod member 28 is connected to a piston rod member 30 which can be provided very inexpensively in the form of a plastic injection molded part, rotary member, casting or cold-formed part.
  • the piston rod member 30 is received to connect the piston rod 62 with the sealing ring 18 in the sealing ring opening 32 of the sealing ring 18.
  • the piston pump 10 further comprises an outlet valve 34 designed as a ball seat valve, which is arranged within an outlet valve cover 36, wherein a ball 38 of the ball seat valve 34 is guided in a receptacle 40 formed in the outlet valve cover 36.
  • the exhaust valve cover 36 may be made partially machined or cold hammered.
  • a coil spring 42 supported on the bottom of the lid presses the ball 38 against a valve seat 44 which is formed in the housing section 12 of the piston pump 10 and which is attached to a housing section 12 formed in the housing section 12 Outlet hole 46 adjacent. Brake fluid flowing from the outlet hole 46 through the exhaust valve 34 flows via a radial passage 48 between the exhaust valve cover 36 and the housing portion 12 toward the pump outlet (not shown).
  • a biasing element in the form of a coil spring 50 is further arranged, which rests with one end on the sealing ring 18 and is supported at the other end at the bottom of the housing portion 12.
  • the coil spring 50 is biased to urge the two-piece piston rod 62 against the circumference of the eccentric of an eccentric drive (not shown) via the sealing ring 18 against which the piston rod 62 rests with its end face disposed within the piston pump 10.
  • the au- ⁇ en lying end face of the piston rod member 28 can always be held in contact with the eccentric.
  • valve seat 52 of the ball inlet valve 22 which can be produced for example by ball stamping, is formed on the end face on the piston rod element 30.
  • This inventive design of the valve seat 52 on the piston rod member 30 of the piston rod 62 provides in connection with the integral embodiment of the sealing ring 18 according to the invention with the inlet valve cover designed as receiving means 20 in the form of the valve cover / seal combination 24 significant advantages in the assembly and disassembly To dismantle the piston pump 10, the piston rod element 30 accommodated with a clearance fit in the sealing ring opening 32 is to be pulled out of the sealing ring opening 32.
  • the inventive clearance provided allows this problem-free release of the piston rod member 30 from the sealing ring 18.
  • a snap connection in the form of a snap-in nose 58 is further formed, which engages around a formed on the piston rod member 30 shoulder.
  • the piston rod 62 can be held during assembly of the piston pump 10, in particular during assembly to the cylinder bore 16 on the sealing ring 18, whereby the assembly of the piston pump 10 according to the invention is substantially simplified.
  • the hold function thus realized according to the invention can alternatively be realized by a thermal deformation after attaching the valve cover / sealing ring combination 24 to the piston rod member 30.
  • the snap nose 58 assumes according to the invention only the described, advantageous for mounting purposes holding function.
  • valve cover / sealing ring combination 24 permanently, despite the advantageous for mounting purposes clearance, rests against the piston rod member 30 in the axial direction. Furthermore, the snap-action nose 58 acts protectively between the cylinder bore 16 and the piston rod member 30. On the sealing ring 18 of the valve cover / sealing ring combination 24, a sealing lip 60 is further formed, which closes the cylinder space between the piston 26 and cylinder bore 16 radially pressure-tight.
  • the piston pump 10 has a radial bore 66 formed in the piston rod member 30 and a central axial bore 68 through which fluid from outside the piston pump can flow through the inlet valve 22.
  • Fig. 2 a sectional view shows a piston pump 64 of the prior art.
  • the receiving means 20 and the sealing ring 18 separate components, which makes the demotage or assembly of the known piston pump 64 significantly more difficult and unlike the inventive piston pump 10 brings a longer tolerance chain with it , Also, no contact protection between the cylinder bore 16 and the piston 26 is provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The invention relates to a piston pump (10) for a vehicle braking system, with a housing section (12) and a piston (26), which is guided in the housing section (12) in a slidable manner, and having an accommodating means (20) for accommodating an intake valve (22), a sealing element (18) adjoining the accommodating means (20) for sealing the piston (26) against the housing section (12), and a piston rod (62) adjoining the sealing element (18), the sealing element (18) being embodied in one piece with the accommodating means (20).

Description

Hintergrund der ErfindungBackground of the invention

Die Erfindung betrifft eine Kolbenpumpe für ein Fahrzeugbremssystem, mit einem Gehäuseabschnitt und einem Kolben, der in dem Gehäuseabschnitt verschiebbar geführt ist und ein Aufnahmemittel zur Aufnahme eines Einlassventils, ein an das Aufnahmemittel anschließendes Dichtelement zum Abdichten des Kolbens gegen den Gehäuseabschnitt und eine an das Dichtelement anschließende Kolbenstange aufweistThe invention relates to a piston pump for a vehicle brake system, comprising a housing section and a piston, which is displaceably guided in the housing section and a receiving means for receiving an inlet valve, a sealing element adjoining the receiving means for sealing the piston against the housing section and a subsequent to the sealing element Piston rod has

Die für bekannte Fahrzeugbremssysteme, insbesondere mit Antiblockiersystem (Abk.: ABS), verwendeten Kolbenpumpen dienen der Steuerung des Drucks in Radbremszylindern. Beim ABS sind die Kolbenpumpen beispielsweise zum Rückfördern von Bremsflüssigkeit aus einem oder mehreren Radbremszylindern in einen Hauptbremszylinder vorgesehen. Das ABS arbeitet oft in Kombination mit einer Antischlupftegelung (Abk.: ASR). Ein weiteres bekanntes System, das sogenannte elektronische Stabilitätsprogramm (Abk.: ESP) verbessert gegenüber ABS und ASR die Fahrsicherheit um einen weiteren Schritt. Während ABS und ASR in Fahrtlängsrichtung wirken, beeinflusst ESP die Querdynamik und ist daher im Prinzip eine Querschlupfregelung. Für alle diese Systeme und auch für weitere Systeme zur Erhöhung der Fahrsicherheit kommen Kolbenpumpen zum Einsatz.The piston pumps used for known vehicle brake systems, in particular with anti-lock braking system (abbr .: ABS), serve to control the pressure in wheel brake cylinders. In the case of ABS, the piston pumps are provided for example for returning brake fluid from one or more wheel brake cylinders into a master brake cylinder. The ABS often works in combination with an anti-skid system (abbr .: ASR). Another well-known system, the so-called electronic stability program (abbr .: ESP) improves driving safety over ABS and ASR by a further step. While ABS and ASR work in the longitudinal direction of travel, ESP influences the lateral dynamics and is therefore in principle a traverse slip control. Piston pumps are used for all these systems and also for other systems to increase driving safety.

Bekannte, für Fahrzeugbremssysteme vorgesehene Kolbenpumpen bestehen unter anderem aus einem in einem Gehäuse ausgebildeten Zylinder, in dem ein Kolben längsbeweglich aufgenommen ist. Der Kolbenantrieb erfolgt meist über einen Exzenterantrieb, bei dem die Drehbewegung einer mittels eines Antriebsmotors angetriebenen Welle in eine translatorische Bewegung des Kolbens umgesetzt wird. Die Kolbenstange wird dabei mit seiner Stirnseite mittels eines Vorspannelements, beispielsweise in Form einer Schraubenfeder, gegen den Außenumfang des Exzenters des Exzenterantriebs gedrückt. So kann letztlich eine hin- und hergehende Pumpbewegung des Kolbens realisiert werden.Known, provided for vehicle brake systems piston pumps consist inter alia of a housing formed in a cylinder in which a piston is received longitudinally movable. The piston drive is usually carried out via an eccentric drive, in which the rotational movement of a driven by a drive motor shaft is converted into a translational movement of the piston. The piston rod is pressed with its end face by means of a biasing element, for example in the form of a helical spring, against the outer periphery of the eccentric of the eccentric drive. Thus, ultimately, a reciprocating pumping movement of the piston can be realized.

Ferner weisen bekannte Kolbenpumpen zur Steuerung der Fluid-Einströmung ein als Sitzventil ausgebildetes Einlassventil auf, wobei in dem Zylinder zwischen dem Einlassventil und dem Kolben ferner ein Dichtelement vorgesehen ist, das längsbeweglich in dem Zylinder geführt ist. Der Kolben bekannter Kolbenpumpen ist mit seiner innerhalb des Zylinders angeordneten Stirnseite an dem Dichtelement angebracht, so dass eine hin- und hergehende Kolbenbewegung unmittelbar auf das Dichtelement übertragen wird. An dem dem Einlassventil zugewandten Ende des Dichtelements ist ein Ventilsitz des als Sitzventil ausgebildeten Einlassventils ausgebildet, wobei zur Fluideinströmung eine sich durch das Dichtelement erstreckende Bohrung vorgesehen ist, die sich bis zum Ventilsitz erstreckt, um das in der Saugphase geöffnete Einlassventil mit Fluid zu durchströmen. Der Absperrkörper des als Sitzventil ausgebildeten Einlassventils wird über ein Federelement gegen den an dem Dichtelement ausgebildeten Ventilsitz gedrückt, wobei der Absperrkörper, das Federelement und das als Ventilsitz ausgebildete Ende des Dichtelements in einem Aufnahmemittel in Form eines Einlass-Ventildeckels aufgenommen sind. Der Einlassventil-Deckel dient als Gegenhalter für das Federelement und als Führung für den Absperrkörper. Um den Einlassventil-Deckel herum ist ein Vorspannelement in Form einer Schraubenfeder angeordnet, die gegen einen an dem Einlassventil-Deckel ausgebildeten Abstützkörper drückt, der in einer in dem Dichtelement ausgebildeten Ausnehmung aufgenommen ist, um die auf den Abstützkörper übertragene Federkraft über das Dichtelement auf den am Dichtelement angebrachten Kolben zu übertragen Auf diese Weise kann letztlich eine Vorspannung auf den Kolben übertragen werden, um die außenliegende Stirnseite des Kolbens gegen den Exzenter des Exzenterantriebs zu drücken.Furthermore, known piston pumps for controlling the fluid inflow as a seat valve formed in the cylinder between the inlet valve and the piston, a sealing element is further provided, which is longitudinally movably guided in the cylinder. The piston of known piston pumps is mounted with its arranged inside the cylinder end face on the sealing element, so that a reciprocating piston movement is transmitted directly to the sealing element. At the end of the sealing element facing the inlet valve, a valve seat of the inlet valve designed as a seat valve is provided, wherein a bore extending through the sealing element is provided for fluid inflow, which extends to the valve seat in order to flow through the inlet valve which is open in the suction phase with fluid. The shut-off of the inlet valve designed as a seat valve is pressed by a spring element against the valve seat formed on the sealing element, wherein the shut-off, the spring element and formed as a valve seat end of the sealing element are accommodated in a receiving means in the form of an inlet valve cover. The inlet valve cover serves as a counterhold for the spring element and as a guide for the shut-off. Around the inlet valve cover, there is disposed a biasing member in the form of a coil spring which presses against a support body formed on the inlet valve cover received in a recess formed in the seal member to apply the spring force transmitted to the support body via the seal member In this way, a bias voltage can ultimately be transmitted to the piston in order to press the outer end face of the piston against the eccentric of the eccentric drive.

Insgesamt betrachtet ist damit in dem Zylinder bekannter Kolbenpumpen eine Vielzahl Pumpenbauteile angeordnet. Dies hat zur Folge, dass die Montage und Demontage bekannter Kolbenpumpen vergleichsweise aufwendig ist. Ferner sind bekannte Kolbenpumpen aufgrund der Vielzahl vorgesehener Pumpenbauteile nicht besonders kostengünstig herstellbar.Overall, a plurality of pump components is thus arranged in the cylinder known piston pumps. This has the consequence that the assembly and disassembly of known piston pumps is relatively expensive. Furthermore, known piston pumps are not particularly inexpensive to produce due to the large number of pump components provided.

Aus WO 2006/013142 A (nächster Stand der Technik) ist eine Kolbenpumpe mit einer Haltevorrichtung zum Halten eines Federelements für eine Rückstellung eines Schließelements eines Ventils bekannt. Die Haltevorrichtung liegt dabei mit einem Dichtbereich auf einer Stirnseite des Kolbens auf.Out WO 2006/013142 A (Next Related Art) is known a piston pump with a holding device for holding a spring element for returning a closing element of a valve. The holding device rests with a sealing area on an end face of the piston.

Zugrundeliegende AufgabeUnderlying task

Der Erfindung liegt die Aufgabe zugrunde, eine Kolbenpumpe für ein Fahrzeugbremssystem anzugeben, die mit geringem Aufwand montiert und demontiert werden kann, und die zudem kostengünstig hergestellt werden kann.The invention has for its object to provide a piston pump for a vehicle brake system that can be assembled and disassembled with little effort, and also can be produced inexpensively.

Erfindungsgemäße LösungInventive solution

Diese Aufgabe ist erfindungsgemäß mit der eingangs genannten Kolbenpumpe für ein Fahrzeugbremssystem gelöst, bei der das Dichtelement einstückig mit dem Aufnahmemittel ausgebildet ist und zwischen dem Dichtelement und der Kolbenstange eine Schnappverbindung ausgebildet ist, um die Kolbenstange am Dichtelement vorzumontieren.This object is achieved with the aforementioned piston pump for a vehicle brake system, wherein the sealing element is integrally formed with the receiving means and between the sealing element and the piston rod a snap connection is formed to pre-assemble the piston rod on the sealing element.

Erfindungsgemäß ist das Dichtelement einstückig mit dem Aufnahmemittel ausgebildet. Dies hat den Vorteil, dass im Unterschied zu den aus dem Stand der Technik bekannten Kolbenpumpen die Funktionen des Dichtelements und des zur Aufnahme eines Einlassventils vorgesehenen Aufnahmemittels von lediglich einem Bauteil übernommen werden. So wird erfindungsgemäß gegenüber den bekannten Lösungen ein Bauteil eingespart, mit der Folge, dass die Montage und Demontage der erfindungsgemäßen Kolbenpumpe sehr einfach vorgenommen werden kann und die Toleranzkette deutlich herabgesetzt wird. Ferner können durch die erfindungsgemäß realisierte Einsparung eines Bauteils die Herstellungskosten der Kolbenpumpe deutlich reduziert werden. Schließlich kann die erfindungsgemäße Kolbenpumpe durch die Einsparung eines Bauteils gegenüber bekannten Pumpen deutlich kleiner ausgeführt werden. Die Schnappverbindung, welche vorzugsweise an dem Dichtelement ausgebildet ist, umgreift beispielsweise eine an der Kolbenstange ausgebildete Schulter. Mittels der erfindungsgemäßen Schnappverbindung kann die Kolbenstange während der Montage der Kolbenpumpe, insbesondere während der Montage am Zylinder über die erfindungsgemäß bereitgestellte Schnappfunktion am Dichtelement gehalten werden. Des Weiteren wird mittels der erfindungsgemäßen Schnappverbindung die Zylinderinnenwand gegenüber dem Außendurchmesser des Kolbens geschützt. Mittels der erfindungsgemäßen Schnappverbindung wird so eine eventuelle Berührung des Kolbens mit der Zylinderinnenwand ausgeschlossen, wodurch Beschädigungen an der Zylinderinnenwand oder an dem Kolben vermieden werden.According to the invention, the sealing element is formed integrally with the receiving means. This has the advantage that, in contrast to the piston pumps known from the prior art, the functions of the sealing element and the receiving means provided for receiving an inlet valve are taken over by only one component. Thus, according to the invention, compared to the known solutions, a component is saved, with the result that the assembly and disassembly of the piston pump according to the invention can be made very easily and the tolerance chain is significantly reduced. Furthermore, the manufacturing costs of the piston pump can be significantly reduced by the inventively realized saving of a component. Finally, the piston pump according to the invention can be made significantly smaller by saving a component compared to known pumps. The snap connection, which is preferably formed on the sealing element, surrounds, for example, a shoulder formed on the piston rod. By means of the snap connection according to the invention, the piston rod during assembly of the piston pump, in particular during assembly on the cylinder via the inventively provided snap action on the sealing element can be maintained. Furthermore, the cylinder inner wall is protected from the outer diameter of the piston by means of the snap connection according to the invention. By means of the snap connection according to the invention a possible contact of the piston with the cylinder inner wall is excluded so that damage to the cylinder inner wall or on the piston can be avoided.

Vorteilhafte Weiterbildungen der ErfindungAdvantageous developments of the invention

Bei einer vorteilhaften Weiterbildung der Erfindung weist das Einlassventil einen Ventilsitz auf, der an der Kolbenstange ausgebildet ist. Diese erfindungsgemäße konstruktive Lösung ermöglicht eine einfache Montage bzw. Demontage der Kolbenpumpe. So ist insbesondere zur Demontage der Kolbenpumpe die an das Dichtelement anschließende Kolbenstange von dem Dichtelement zu entfernen. Anschließend kann das Einlassventil, das vorzugsweise als Sitzventil ausgebildet ist, samt seiner einzelnen Komponenten, umfassend insbesondere einen Absperrkörper und ein Federelement, ohne großen Aufwand aus dem einstückig mit dem Dichtelement ausgebildeten Aufnahmemittel entnommen werden. Das in dem Zylinder der Kolbenpumpe längsbeweglich aufgenommene Dichtelement, an dem das Aufnahmemittel einstückig ausgebildet ist, kann schließlich problemlos aus dem Zylinder entnommen werden.In an advantageous embodiment of the invention, the inlet valve has a valve seat, which is formed on the piston rod. This constructive solution according to the invention enables easy assembly and disassembly of the piston pump. Thus, in particular for dismantling the piston pump, the piston rod adjoining the sealing element is to be removed from the sealing element. Subsequently, the inlet valve, which is preferably designed as a seat valve, together with its individual components, comprising in particular a shut-off and a spring element can be removed without much effort from the integrally formed with the sealing element receiving means. The longitudinally movably received in the cylinder of the piston pump sealing element, on which the receiving means is integrally formed, can finally be easily removed from the cylinder.

Bei einer weiteren vorteilhaften Weiterbildung der Erfindung ist ein Vorspannelement, vorzugsweise in Form einer Schraubenfeder vorgesehen, das an dem Dichtelement anliegt und mit dem der Kolben in Richtung aus dem Gehäuseabschnitt herausgedrängt ist. Die von dem Vorspannelement auf das Dichtelement übertragene Vorspannkraft hält den Kolben stets in Außenlage. Auf diese Weise kann erfindungsgemäß die außenliegende Stirnseite des Kolbens gegen den Exzenter eines Exzenterantriebs gedrückt werden, um so eine von dem Exzenterantrieb bereitgestellte translatorische Antriebsbewegung in eine hin- und hergehende Pumpbewegung des Kolbens umzusetzen. Mittels des Vorspannelements kann die erfindungsgemäße Kolbenpumpe in Verbindung mit Exzenterantrieben verwendet werden, die in Bremssystemen zum Antrieb der Kolbenpumpen vorzugsweise verwendet werden.In a further advantageous embodiment of the invention, a biasing element, preferably provided in the form of a helical spring, which bears against the sealing element and with which the piston is forced out in the direction of the housing portion. The biasing force transmitted to the sealing element by the biasing element always keeps the piston in the outer position. In this way, according to the invention, the outer end face of the piston can be pressed against the eccentric of an eccentric drive, so as to convert a provided by the eccentric drive translational drive movement in a reciprocating pumping movement of the piston. By means of the biasing element, the piston pump according to the invention can be used in conjunction with eccentric drives, which are preferably used in brake systems for driving the piston pumps.

Bei einer praktischen Weiterbildung der Erfindung ist das Dichtelement in Form eines Dichtrings mit einer Dichtringöffnung ausgebildet und die Kolbenstange ist in der Dichtringöffnung aufgenommen, wobei die Kolbenstange vorzugsweise mit einer Spielpassung in der Dichtringöffnung aufgenommen ist. Mittels einer Spielpassung kann die Kolbenstange problemlos in der Dichtringöffnung zentriert werden. Ferner ermöglicht eine Spielpassung ein für Demontagezwecke erforderliches problemloses Lösen der Kolbenstange aus der Dichtringöffnung.In a practical development of the invention, the sealing element is designed in the form of a sealing ring with a sealing ring opening and the piston rod is received in the sealing ring opening, wherein the piston rod is preferably received with a clearance fit in the sealing ring opening. By means of a clearance fit, the piston rod can be easily centered in the sealing ring opening. Furthermore, a clearance allows a required for disassembly problem-free release of the piston rod from the seal ring opening.

Kurzbeschreibung der ZeichnungenBrief description of the drawings

Nachfolgend werden Ausführungsbeispiele einer erfindungsgemäßen Kolbenpumpe anhand der beigefügten schematischen Zeichnungen näher erläutert. Es zeigt:

Fig. 1
einen Längsschnitt einer erfindungsgemäßen Kolbenpumpe,
Fig. 2
einen Längsschnitt einer Kolbenpumpe des Standes der Technik,
Embodiments of a piston pump according to the invention will be explained in more detail with reference to the accompanying schematic drawings. It shows:
Fig. 1
a longitudinal section of a piston pump according to the invention,
Fig. 2
a longitudinal section of a piston pump of the prior art,

Die Fig. 1 zeigt eine erfindungsgemäße Kolbenpumpe 10. Die Kolbenpumpe 10 umfasst zwei Gehäuseabschnitte 12 und 14, wobei in dem Gehäuseabschnitte 12 eine Zylinderbohrung 16 ausgebildet ist, in der ein Kolben 26 verschiebbar geführt ist. Der Kolben 26 umfasst ein Dichtelement in Form eines Dichtrings 18, ein Aufnahmemittel 20 für ein als Kugelsitzventil ausgebildetes Einlassventil 22, welches einstückig mit dem Dichtring 18 ausgebildet ist und vorliegend als Einlassventil-Deckel ausgebildet ist, und eine Kolbenstange 62, die an denThe Fig. 1 shows a piston pump 10 according to the invention. The piston pump 10 comprises two housing sections 12 and 14, wherein in the housing sections 12, a cylinder bore 16th is formed, in which a piston 26 is slidably guided. The piston 26 comprises a sealing element in the form of a sealing ring 18, a receiving means 20 for a designed as a ball seat inlet valve 22 which is integrally formed with the sealing ring 18 and in the present case is formed as an inlet valve cover, and a piston rod 62, the

Dichtring 18 anschließt. Die Kolbenstange 62 ist zweistückig ausgebildet und umfasst zwei Kolbenstangenelemente 28, 30, wobei das Kolbenstangenelement 28 mittels einer Presspassung fest in dem Kolbenstangenelement 30 aufgenommen ist, um eine kraftschlüssige Verbindung zwischen den beiden Kolbenstangenelementen 28, 30 zu schaffen. Durch die vorgesehene zweistückige Ausbildung der Kolbenstange 62 kann eine kostengünstig herzustellende Kolbenstange 62 realisiert werden, da erfindungsgemäß ein kostengünstiges stangenförmiges Kolbenstangenelement 28 mit einem Kolbenstangenelement 30 verbunden wird, das sehr kostengünstig in Form eines Kunststoffspritzteils, Drehteils, Gussteils oder Kaltschlagteils bereitgestellt werden kann.Sealing ring 18 connects. The piston rod 62 is formed in two pieces and comprises two piston rod elements 28, 30, wherein the piston rod member 28 is received by means of a press fit firmly in the piston rod member 30 to provide a frictional connection between the two piston rod elements 28, 30. The proposed two-piece design of the piston rod 62, a cost-producing piston rod 62 can be realized, since the invention, a cost rod-shaped piston rod member 28 is connected to a piston rod member 30 which can be provided very inexpensively in the form of a plastic injection molded part, rotary member, casting or cold-formed part.

Das als Einlassventil-Deckel gestaltete Aufnahmeelement 20 und der Dichtring 18 bilden zusammen eine einstückige Ventildeckel/Dichtring-Kombination 24. Das Kolbenstangenelement 30 ist zur Verbindung der Kolbenstange 62 mit dem Dichtring 18 in der Dichtringöffnung 32 des Dichtrings 18 aufgenommen.The receiving element designed as an inlet valve cover 20 and the sealing ring 18 together form a one-piece valve cover / sealing ring combination 24. The piston rod member 30 is received to connect the piston rod 62 with the sealing ring 18 in the sealing ring opening 32 of the sealing ring 18.

Die Kolbenpumpe 10 weist ferner ein als Kugelsitzventil ausgebildetes Auslassventil 34 auf, das innerhalb eines Auslassventil-Deckels 36 angeordnet ist, wobei eine Kugel 38 des Kugelsitzventils 34 in einer in dem Auslassventil-Deckel 36 ausgebildeten Aufnahme 40 geführt ist. Der Auslassventil-Deckel 36 kann teilweise spanabhebend oder kaltgeschlagen gefertigt sein. Eine sich am Deckelboden abstützende Schraubenfeder 42 drückt die Kugel 38 gegen einen im Gehäuseabschnitt 12 der Kolbenpumpe 10 ausgebildeten Ventilsitz 44, der an ein in dem Gehäuseabschnitt 12 ausgebildetes Auslassloch 46 angrenzt. Von dem Auslassloch 46 durch das Auslassventil 34 strömende Bremsflüssigkeit strömt über einen Radialkanal 48 zwischen dem Auslassventil-Deckel 36 und dem Gehäuseabschnitt 12 in Richtung Pumpen-Auslass (nicht dargestellt).The piston pump 10 further comprises an outlet valve 34 designed as a ball seat valve, which is arranged within an outlet valve cover 36, wherein a ball 38 of the ball seat valve 34 is guided in a receptacle 40 formed in the outlet valve cover 36. The exhaust valve cover 36 may be made partially machined or cold hammered. A coil spring 42 supported on the bottom of the lid presses the ball 38 against a valve seat 44 which is formed in the housing section 12 of the piston pump 10 and which is attached to a housing section 12 formed in the housing section 12 Outlet hole 46 adjacent. Brake fluid flowing from the outlet hole 46 through the exhaust valve 34 flows via a radial passage 48 between the exhaust valve cover 36 and the housing portion 12 toward the pump outlet (not shown).

In der in dem Gehäuseabschnitt 12 ausgebildeten Zylinderbohrung 16 ist ferner ein Vorspannelement in Form einer Schraubenfeder 50 angeordnet, die mit einem Ende an dem Dichtring 18 anliegt und sich mit dem anderen Ende am Boden des Gehäuseabschnitts 12 abstützt. Die Schraubenfeder 50 steht unter Vorspannung, um die zweistückige Kolbenstange 62 über den Dichtring 18, an dem die Kolbenstange 62 mit ihrer innerhalb der Kolbenpumpe 10 angeordneten Stirnseite anliegt, gegen den Umfang des Exzenters eines Exzenterantriebs (nicht dargestellt) zu drücken. So kann die au-βen liegende Stirnseite des Kolbenstangenelements 28 stets in Anlage zu dem Exzenter gehalten werden. Durch rotierenden Antrieb des Exzenters wird der gesamte Kolben 26 zu einer axial hin- und hergehenden Hubbewegung angetrieben, die in bekannter Weise eine Förderung von Bremsflüssigkeit bewirkt.In the housing bore 12 formed in the cylinder bore 16, a biasing element in the form of a coil spring 50 is further arranged, which rests with one end on the sealing ring 18 and is supported at the other end at the bottom of the housing portion 12. The coil spring 50 is biased to urge the two-piece piston rod 62 against the circumference of the eccentric of an eccentric drive (not shown) via the sealing ring 18 against which the piston rod 62 rests with its end face disposed within the piston pump 10. Thus, the au-βen lying end face of the piston rod member 28 can always be held in contact with the eccentric. By rotating drive of the eccentric, the entire piston 26 is driven to an axially reciprocating stroke movement, which causes a promotion of brake fluid in a known manner.

Der Ventilsitz 52 des Kugel-Einlassventils 22, der beispielsweise durch Kugelprägen hergestellt werden kann, ist stirnseitig an dem Kolbenstangenelement 30 ausgebildet. Diese erfindungsgemäße Ausbildung des Ventilsitzes 52 an dem Kolbenstangenelement 30 der Kolbenstange 62 bietet in Verbindung mit der erfindungsgemäßen einstückigen Ausbildung des Dichtrings 18 mit dem als Einlassventil-Deckel gestalteten Aufnahmemittel 20 in Form der Ventildeckel/Dichtring-Kombination 24 deutliche Vorteile bei der Montage bzw. Demontage der Kolbenpumpe 10. Zur Demontage der Kolbenpumpe 10 ist das mit einer Spielpassung in der Dichtringöffnung 32 aufgenommene Kolbenstangenelement 30 aus der Dichtringöffnung 32 zu ziehen. Die erfindungsgemäße vorgesehene Spielpassung ermöglicht hierbei ein problemlosen Lösen des Kolbenstangenelements 30 aus dem Dichtring 18. Die einzelnen Komponenten des Sitzventils 22, also die Kugel 54 und die Schraubenfeder 56 können anschließend problemlos aus dem Aufnahmemittel 20 entnommen werden. Schließlich kann nach Herausziehen der einstückig ausgebildeten Ventildeckel/Dichtring-Kombination 24 aus der Zylinderbohrung 16 die Schraubenfeder 50 aus der Zylinderbohrung 16 entnommen werden. Entsprechend einfach gestaltet sich auch die Montage der Kolbenpumpe 10, wobei die vorgesehene Spielpassung eine problemlose Zentrierung des Kolbenstangenelements 30 in der Dichtringöffnung 32 ermöglicht.The valve seat 52 of the ball inlet valve 22, which can be produced for example by ball stamping, is formed on the end face on the piston rod element 30. This inventive design of the valve seat 52 on the piston rod member 30 of the piston rod 62 provides in connection with the integral embodiment of the sealing ring 18 according to the invention with the inlet valve cover designed as receiving means 20 in the form of the valve cover / seal combination 24 significant advantages in the assembly and disassembly To dismantle the piston pump 10, the piston rod element 30 accommodated with a clearance fit in the sealing ring opening 32 is to be pulled out of the sealing ring opening 32. The inventive clearance provided allows this problem-free release of the piston rod member 30 from the sealing ring 18. The individual components of the seat valve 22, so the ball 54 and the coil spring 56 can then be easily removed from the receiving means 20. Finally, after pulling out the integrally formed valve cover / sealing ring combination 24 from the cylinder bore 16, the coil spring 50 can be removed from the cylinder bore 16. Correspondingly simple, the assembly of the piston pump 10 designed, the intended clearance fit allows easy centering of the piston rod member 30 in the sealing ring opening 32.

An dem Dichtring 18 ist ferner eine Schnappverbindung in Form einer Schnappnase 58 ausgebildet, die eine am dem Kolbenstangenelement 30 ausgebildete Schulter umgreift. Mittels der Schnappnase 58 kann die Kolbenstange 62 während der Montage der Kolbenpumpe 10, insbesondere während der Montage an der Zylinderbohrung 16 an dem Dichtring 18 gehalten werden, wodurch die Montage der erfindungsgemäßen Kolbenpumpe 10 wesentlich vereinfacht wird. Die so erfindungsgemäß realisierte Haltefunktion kann alternativ auch durch eine thermische Verformung nach Aufstecken der Ventildeckel/Dichtring-Kombination 24 auf das Kolbenstangenelement 30 realisiert werden. Die Schnappnase 58 übernimmt erfindungsgemäß lediglich die beschriebene, für Montagezwecke vorteilhafte Haltefunktion. Während des Betriebs der Kolbenpumpe 10 wird durch die Federkraft der Schraubenfeder 50 sichergestellt, dass die Ventildeckel/Dichtring-Kombination 24 permanent, trotz der für Montagezwecke vorteilhaften Spielpassung, an dem Kolbenstangenelement 30 in axialer Richtung anliegt. Ferner wirkt die Schnappnase 58 schützend zwischen der Zylinderbohrung 16 und dem Kolbenstangenelement 30. An dem Dichtring 18 der Ventildeckel/Dichtring-Kombination 24 ist ferner eine Dichtlippe 60 ausgebildet, welche den Zylinderraum zwischen Kolben 26 und Zylinderbohrung 16 radial druckdicht abschließt.On the sealing ring 18 a snap connection in the form of a snap-in nose 58 is further formed, which engages around a formed on the piston rod member 30 shoulder. By means of the snap nose 58, the piston rod 62 can be held during assembly of the piston pump 10, in particular during assembly to the cylinder bore 16 on the sealing ring 18, whereby the assembly of the piston pump 10 according to the invention is substantially simplified. The hold function thus realized according to the invention can alternatively be realized by a thermal deformation after attaching the valve cover / sealing ring combination 24 to the piston rod member 30. The snap nose 58 assumes according to the invention only the described, advantageous for mounting purposes holding function. During operation of the piston pump 10 is ensured by the spring force of the coil spring 50 that the valve cover / sealing ring combination 24 permanently, despite the advantageous for mounting purposes clearance, rests against the piston rod member 30 in the axial direction. Furthermore, the snap-action nose 58 acts protectively between the cylinder bore 16 and the piston rod member 30. On the sealing ring 18 of the valve cover / sealing ring combination 24, a sealing lip 60 is further formed, which closes the cylinder space between the piston 26 and cylinder bore 16 radially pressure-tight.

Schließlich weist die Kolbenpumpe 10 eine in dem Kolbenstangenelement 30 ausgebildete Radialbohrung 66 und eine zentrale Axialbohrung 68 auf, durch die Fluid von außerhalb der Kolbenpumpe durch das Einlassventil 22 strömen kann.Finally, the piston pump 10 has a radial bore 66 formed in the piston rod member 30 and a central axial bore 68 through which fluid from outside the piston pump can flow through the inlet valve 22.

Die Fig. 2 zeigt eine Schnittansicht eine Kolbenpumpe 64 des Standes der Technik. Im Unterschied zu der erfindungsgemäßen Kolbenpumpe 10 sind bei der bekannten Kolbenpumpe 64 insbesondere das Aufnahmemittel 20 und der Dichtring 18 separate Bauteile, was die Demotage bzw. Montage der bekannten Kolbenpumpe 64 deutlich erschwert und im Unterschied zu der erfindungsgemäßen Kolbenpumpe 10 eine längere Toleranzkette mit sich bringt. Auch ist kein Berührungsschutz zwischen der Zylinderbohrung 16 und dem Kolben 26 vorgesehen.The Fig. 2 a sectional view shows a piston pump 64 of the prior art. In contrast to the piston pump 10 according to the invention in the known piston pump 64, in particular the receiving means 20 and the sealing ring 18 separate components, which makes the demotage or assembly of the known piston pump 64 significantly more difficult and unlike the inventive piston pump 10 brings a longer tolerance chain with it , Also, no contact protection between the cylinder bore 16 and the piston 26 is provided.

Claims (5)

  1. Piston pump (10) for a vehicle brake system, with a housing portion (12) and with a piston (26) which is guided displaceably in the housing portion (12) and has a reception means (20) for receiving an inlet valve (22), a sealing element (18), adjacent to the reception means (20), for sealing off the piston (26) with respect to the housing portion (12), and a piston rod (62) adjacent to the sealing element (18), in which piston pump
    - the sealing element (18) is formed in one piece with the reception means (20),
    characterized in that
    - a snap connection (58) is formed between the sealing element (18) and the piston rod (62) in order to premount the piston rod (62) on the sealing element (18).
  2. Piston pump according to Claim 1,
    characterized in that the inlet valve (22) has a valve seat (52) which is formed on the piston rod (62).
  3. Piston pump according to Claim 1 or 2,
    characterized in that a prestressing element, preferably in the form of a helical spring (50), is provided, which bears against the sealing element (18) and by means of which the piston (26) is urged in a direction out of the housing portion (12).
  4. Piston pump according to one of Claims 1 to 3,
    characterized in that the sealing element (18) is designed in the form of a sealing ring with a sealing-ring orifice (32), and the piston rod (62) is received in the sealing-ring orifice (32).
  5. Piston pump according to Claim 4,
    characterized in that the piston rod (62) is received with a clearance fit in the sealing-ring orifice (32).
EP07729395A 2006-06-27 2007-05-22 Piston pump for a vehicle braking system with a sealing element Active EP2038551B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006029368A DE102006029368A1 (en) 2006-06-27 2006-06-27 Piston pump for a vehicle brake system with a sealing element
PCT/EP2007/054956 WO2008000557A1 (en) 2006-06-27 2007-05-22 Piston pump for a vehicle braking system with a sealing element

Publications (2)

Publication Number Publication Date
EP2038551A1 EP2038551A1 (en) 2009-03-25
EP2038551B1 true EP2038551B1 (en) 2012-04-11

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EP07729395A Active EP2038551B1 (en) 2006-06-27 2007-05-22 Piston pump for a vehicle braking system with a sealing element

Country Status (6)

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US (1) US8414276B2 (en)
EP (1) EP2038551B1 (en)
KR (1) KR101115298B1 (en)
CN (1) CN101479472B (en)
DE (1) DE102006029368A1 (en)
WO (1) WO2008000557A1 (en)

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Publication number Publication date
WO2008000557A1 (en) 2008-01-03
CN101479472B (en) 2012-07-11
KR101115298B1 (en) 2012-03-05
US20090220363A1 (en) 2009-09-03
KR20090014306A (en) 2009-02-09
EP2038551A1 (en) 2009-03-25
CN101479472A (en) 2009-07-08
US8414276B2 (en) 2013-04-09
DE102006029368A1 (en) 2008-01-03

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